Get a multimeter, they’re stupid cheap these days.
Check voltage at battery posts. Start car and should jump from 12ish to 14ish. You can’t really ‘be certain’, but that’s a good indicator. If you’re not seeing that increase, your alternator is bad. Don’t assume because you replaced it that it is good...most people buy whatever’s cheap and they’re all rebuilt off shore and there is like zero guarantee that it’s not bad.
Assuming your battery is charging and shows 12v when off, disconnect a terminal from battery and jumper the terminal/cable looking for Amps. You’ll need to keep this jumper we uninterrupted for the time period. When things go to sleep, anything over 30mA is excessive. But if dying in 10-15 minutes? You would need to be seeing an awful lot of amperage draw.
Could be a solenoid or module gone bad, but most likely is the replacement alternator has failed.
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No, no…I’m not sloppy, or lazy. This is a sign of the boredom.
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